I was talking to a mum who was using different style teats for advent bottles that were more like "beaker"shapes - to help train a baby from a teat onto a beaker. Can you still get these? are they any good? I mainly breast feed / starting to wean but do one bottle top up feed a day and am thinking about using that to help train them into using a beaker. If anyone has one or two spare I would like to test them out. Thanks.